Below is a look at each team's television market size, and tier
winning percentage over the last three seasons. The yellow line
is the trendline, which is nearly flat (R^2 = 0.05). That tells
us there is no relationship between a team's market size and the
product they put on the field. If bigger cities had an advantage
on the field, we would see the yellow line slanted up much more.

Of course, we have seen this in the standings in recent years
with teams like the Tampa
Bay Rays, who have won the American League East two of the
past three seasons. And we have also seen teams like the New York
Mets who have struggled to field even a mediocre team, despite
playing in the biggest market of them all.

Market size may influence the team's bottom-line. But it clearly
has little or no impact on the winning-line.